Author: jhb
Date: Thu May 26 21:43:22 2016
New Revision: 300780
URL: https://svnweb.freebsd.org/changeset/base/300780
Log:
Add some routines for working with EFI DEVICE_PATH objects.
- efi_lookup_devpath() uses the DEVICE_PATH_PROTOCOL to obtain the
DEVICE_PATH for a given EFI handle.
- efi_lookup_image_devpath() uses the LOADED_IMAGE_DEVICE_PATH_PROTOCOL
to lookup the device path of the device used to load a loaded image.
- efi_devpath_name() uses the DEVICE_PATH_TO_TEXT_PROTOCOL to generate
a string description of a device path. The returned string is a CHAR16
string that can be printed via the recently added '%S' format in
libstand's printf(). Note that the returned string is returned in
allocated storage that should be freed by calling
efi_free_devpath_name().
- efi_devpath_last_node() walks a DEVICE_PATH returning a pointer to the
final node in the path (not counting the terminating node). That is,
it returns a pointer to the last meaninful node in a DEVICE_PATH.
- efi_devpath_trim() generates a new DEVICE_PATH from an existing
DEVICE_PATH. The new DEVICE_PATH does not include the last
non-terminating node in the original path. If the original DEVICE_PATH
only contains the terminating node, this function returns NULL.
The caller is responsible for freeing the returned DEVICE_PATH via
free().
- efi_devpath_handle() attempts to find a handle that corresponds to a
given device path. However, if nodes at the end of the device path do
not have valid handles associated with them, this function will return
a handle that matches a node earlier in the device path. In particular,
this function returns a handle for the node closest to the end of the
device path which has a valid handle.
Sponsored by: Cisco Systems
Added:
head/sys/boot/efi/libefi/devpath.c (contents, props changed)
Modified:
head/sys/boot/efi/include/efilib.h
head/sys/boot/efi/libefi/Makefile
Modified: head/sys/boot/efi/include/efilib.h
==============================================================================
--- head/sys/boot/efi/include/efilib.h Thu May 26 21:40:13 2016
(r300779)
+++ head/sys/boot/efi/include/efilib.h Thu May 26 21:43:22 2016
(r300780)
@@ -45,6 +45,14 @@ EFI_HANDLE efi_find_handle(struct devsw
int efi_handle_lookup(EFI_HANDLE, struct devsw **, int *, uint64_t *);
int efi_handle_update_dev(EFI_HANDLE, struct devsw *, int, uint64_t);
+EFI_DEVICE_PATH *efi_lookup_image_devpath(EFI_HANDLE);
+EFI_DEVICE_PATH *efi_lookup_devpath(EFI_HANDLE);
+EFI_HANDLE efi_devpath_handle(EFI_DEVICE_PATH *);
+EFI_DEVICE_PATH *efi_devpath_last_node(EFI_DEVICE_PATH *);
+EFI_DEVICE_PATH *efi_devpath_trim(EFI_DEVICE_PATH *);
+CHAR16 *efi_devpath_name(EFI_DEVICE_PATH *);
+void efi_free_devpath_name(CHAR16 *);
+
int efi_status_to_errno(EFI_STATUS);
EFI_STATUS main(int argc, CHAR16 *argv[]);
Modified: head/sys/boot/efi/libefi/Makefile
==============================================================================
--- head/sys/boot/efi/libefi/Makefile Thu May 26 21:40:13 2016
(r300779)
+++ head/sys/boot/efi/libefi/Makefile Thu May 26 21:43:22 2016
(r300780)
@@ -4,8 +4,8 @@ LIB= efi
INTERNALLIB=
WARNS?= 2
-SRCS= delay.c efi_console.c efinet.c efipart.c env.c errno.c handles.c \
- libefi.c time.c
+SRCS= delay.c devpath.c efi_console.c efinet.c efipart.c env.c errno.c \
+ handles.c libefi.c time.c
.if ${MACHINE_CPUARCH} == "aarch64"
CFLAGS+= -msoft-float -mgeneral-regs-only
Added: head/sys/boot/efi/libefi/devpath.c
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/sys/boot/efi/libefi/devpath.c Thu May 26 21:43:22 2016
(r300780)
@@ -0,0 +1,167 @@
+/*-
+ * Copyright (c) 2016 John Baldwin <j...@freebsd.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <efi.h>
+#include <efilib.h>
+
+/* XXX: This belongs in an efifoo.h header. */
+#define EFI_LOADED_IMAGE_DEVICE_PATH_PROTOCOL_GUID
\
+ { 0xbc62157e, 0x3e33, 0x4fec, { 0x99, 0x20, 0x2d, 0x3b, 0x36, 0xd7, 0x50,
0xdf } }
+
+#define EFI_DEVICE_PATH_TO_TEXT_PROTOCOL_GUID
\
+ { 0x8b843e20, 0x8132, 0x4852, { 0x90, 0xcc, 0x55, 0x1a, 0x4e, 0x4a, 0x7f,
0x1c } }
+
+INTERFACE_DECL(_EFI_DEVICE_PATH_PROTOCOL);
+
+typedef
+CHAR16*
+(EFIAPI *EFI_DEVICE_PATH_TO_TEXT_NODE) (
+ IN struct _EFI_DEVICE_PATH *This,
+ IN BOOLEAN DisplayOnly,
+ IN BOOLEAN AllowShortCuts
+ );
+
+typedef
+CHAR16*
+(EFIAPI *EFI_DEVICE_PATH_TO_TEXT_PATH) (
+ IN struct _EFI_DEVICE_PATH *This,
+ IN BOOLEAN DisplayOnly,
+ IN BOOLEAN AllowShortCuts
+ );
+
+typedef struct _EFI_DEVICE_PATH_TO_TEXT_PROTOCOL {
+ EFI_DEVICE_PATH_TO_TEXT_NODE ConvertDeviceNodeToText;
+ EFI_DEVICE_PATH_TO_TEXT_PATH ConvertDevicePathToText;
+} EFI_DEVICE_PATH_TO_TEXT_PROTOCOL;
+
+static EFI_GUID ImageDevicePathGUID =
+ EFI_LOADED_IMAGE_DEVICE_PATH_PROTOCOL_GUID;
+static EFI_GUID DevicePathGUID = DEVICE_PATH_PROTOCOL;
+static EFI_GUID DevicePathToTextGUID = EFI_DEVICE_PATH_TO_TEXT_PROTOCOL_GUID;
+static EFI_DEVICE_PATH_TO_TEXT_PROTOCOL *textProtocol;
+
+EFI_DEVICE_PATH *
+efi_lookup_image_devpath(EFI_HANDLE handle)
+{
+ EFI_DEVICE_PATH *devpath;
+ EFI_STATUS status;
+
+ status = BS->HandleProtocol(handle, &ImageDevicePathGUID,
+ (VOID **)&devpath);
+ if (EFI_ERROR(status))
+ devpath = NULL;
+ return (devpath);
+}
+
+EFI_DEVICE_PATH *
+efi_lookup_devpath(EFI_HANDLE handle)
+{
+ EFI_DEVICE_PATH *devpath;
+ EFI_STATUS status;
+
+ status = BS->HandleProtocol(handle, &DevicePathGUID, (VOID **)&devpath);
+ if (EFI_ERROR(status))
+ devpath = NULL;
+ return (devpath);
+}
+
+CHAR16 *
+efi_devpath_name(EFI_DEVICE_PATH *devpath)
+{
+ static int once = 1;
+ EFI_STATUS status;
+
+ if (devpath == NULL)
+ return (NULL);
+ if (once) {
+ status = BS->LocateProtocol(&DevicePathToTextGUID, NULL,
+ (VOID **)&textProtocol);
+ if (EFI_ERROR(status))
+ textProtocol = NULL;
+ once = 0;
+ }
+ if (textProtocol == NULL)
+ return (NULL);
+
+ return (textProtocol->ConvertDevicePathToText(devpath, TRUE, TRUE));
+}
+
+void
+efi_free_devpath_name(CHAR16 *text)
+{
+
+ BS->FreePool(text);
+}
+
+EFI_DEVICE_PATH *
+efi_devpath_last_node(EFI_DEVICE_PATH *devpath)
+{
+
+ if (IsDevicePathEnd(devpath))
+ return (NULL);
+ while (!IsDevicePathEnd(NextDevicePathNode(devpath)))
+ devpath = NextDevicePathNode(devpath);
+ return (devpath);
+}
+
+EFI_DEVICE_PATH *
+efi_devpath_trim(EFI_DEVICE_PATH *devpath)
+{
+ EFI_DEVICE_PATH *node, *copy;
+ size_t prefix, len;
+
+ node = efi_devpath_last_node(devpath);
+ prefix = (UINT8 *)node - (UINT8 *)devpath;
+ if (prefix == 0)
+ return (NULL);
+ len = prefix + DevicePathNodeLength(NextDevicePathNode(node));
+ copy = malloc(len);
+ memcpy(copy, devpath, prefix);
+ node = (EFI_DEVICE_PATH *)((UINT8 *)copy + prefix);
+ SetDevicePathEndNode(node);
+ return (copy);
+}
+
+EFI_HANDLE
+efi_devpath_handle(EFI_DEVICE_PATH *devpath)
+{
+ EFI_STATUS status;
+ EFI_HANDLE h;
+
+ /*
+ * There isn't a standard way to locate a handle for a given
+ * device path. However, querying the EFI_DEVICE_PATH protocol
+ * for a given device path should give us a handle for the
+ * closest node in the path to the end that is valid.
+ */
+ status = BS->LocateDevicePath(&DevicePathGUID, &devpath, &h);
+ if (EFI_ERROR(status))
+ return (NULL);
+ return (h);
+}
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